Extension-ladder



(No Model.)

B. S. ISARD.

EXTENSION LADDER. No. 337,955. PatentedMar. 16 1886.

WITNESSES Y 7201551! 51512112 I/VVE/VTOR f %tx7 14 s k Attorneys N. PETERS. Ptwwmmgnahcr, Washington. D. c.

NI ATE ROBERT S. ISARD, OF HUDSON, OHIO.

EXTENSION-LADDER.

SPECIFICATION forming part of Letters Patent No. 337,955, dated March 16, 1886.

Application filed June 30, 1885. Serial No. 170,220. (No model.)

To all whom it may concern:

Be it known that I, Bonner S. ISARD, of Hudson, in the county of Summit and State of Ohio, have invented certain new and useful Improvements in Extension-Ladders; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to extension-ladders; and it consists in certain improvements in parts and combination of parts, more fully described, and pointed out in the claims.

Figure 1 represents an extension-ladder embodying my invention in front elevation. Fig. 2 is a detached view of the upperpnlleys and rope-guides, part of the ladder-sections being shown in section. Fig. 3 is a detached View in section on line as m of Fig. 1. Fig. 4 is a detached View of the Windlass. Fig. 5 is a detached view in section on line 91? of Fig. 3.

In the drawings, A represents the lower section of an extension-ladder provided with an adjustable section, 0, which has a longitudinal movement in guideway a, formed in the lower section, A, by fastening the steps a to the front and rear faces of the laddersupports B of the lower section, A.

B are supports ofthe lower section, A, and are provided with a longitudinal groove or recess, A, upon their inner faces, to allow the free passage of the ropes C while moving up or down with the upper section, 0. (See Figs. 3 and 5.)

C is the upper section,and is so constructed that it is permitted to readily pass between the side supports, B, and steps a of the lower section, A, and is adapted to be raised and lowered by means of ropes O, which are secured at some convenient point at or near the bottom of its supports, and pass through the longitudinal grooves A on the inner face of the supports B of the lower section, A, and over pulleys D, which are secured to supports 13, at or near their upper end. The ropes O are kept in position on pulleys D bymeans of guides E, secured to supports B of the lower section, A. From guides E ropes O runin a parallel line to supports B of the lower section,A, and arefastened,respective1y,to drumsfandf of Windlass F, which is secured to the lower section, A, near the bottom of its supports B.

The lower section, A,is provided withawindlass, F, near its lower end, which serves to raise and lower the upper section, 0, by means of ropes G and O", in connection with the drums ff f and crank-handle f*. Rope O is secured to the central drum, f of Windlass F, and preferably to the lower step, although it may be attached to any of the steps 0 of the upper section, 0, and serves to draw the upper section, O, downward, its movement being directly opposite to that of ropes G, and while being coiled upon drum f of the windlass F ropes O are uncoiling from off the drumsf and f. Drum f is provided with any suitable device for holding Windlass F in a stationary position. A pawl and ratchet, f, is shown in Fig. 4. Crank handle f serves to raise and lower the upper section, 0, by means of Windlass F. Steps 0 of the upper section, 0, are placed the same distance apart as steps a of the lower section, A, providing a better footing when the upper section, 0, is in a stationary position, so that the steps a and care directly opposite each other, (see Figs. 3 and 5,) affording a broad support for the feet. The upper section, 0, is provided at its upper end with small truck-wheels c, to facilitate a more easy movement of the upper section, 0, when placed against buildings, &c.

The operation of my device is as follows, viz: When it is desired to raise the upper section, 0, in prolongation of the lower section, A, the Windlass F is revolved by means of crank-handler. During this operation the ropes C, which are secured to the upper section, 0, are being drawn through the longitudinal grooves A upon the inner face of supports B of the lower section, A, over pulleys D and through guides E, both of which are secured to supports B of the lower section, A, and coiled upon the drumsf and f of the Windlass F. At the same time rope 0*, secured to the upper section, 0, is uncoiled from off drum f of the Windlass at any point of this movement. If desired, the upper section, 0, may be held in a stationary position by means of a pawl and ratchet, f, of drum f and secured to the windlass F. During the upward movement of the upper section, 0, the small truck-wheels a, secured to said upper section, come in contact with building or other obstruction, against which ICC the ladder is placed, and serve to lessen the friction of the upper section, (3, against the building.

What I claim is 1. In an extension-ladder, in combination with a lower main section, an upper adjustable section guided in said lower section, longitudinal grooves in the inner faces of the supports of the lower section, a Windlass journaled on the said supports and carrying three drums, two Without and one within the sup ports, a rope fixed at one end to the central drum and at the other to a round of the upper section of the ladder, two additional ropes fixed at their lower ends to the outerdr'ii'ins and at their upper ends to the upper section, "and pulleys journaled in the top of the lower section and carrying said latter ropes, substantially as and for the purpose set forth.

2. In an extension-ladder, in combination 20 with lower main section carrying pulleys at top and Windlass having drums and ropes, as

I described, at bottom, guides fixed to the lower ROBERT S. ISARD.

Witnesses:

S. E. JUDD, Geo. W. STONE. 

